I’m surprised I haven’t seen the right answers here yet, so I will chime in. 1. Russia produces 12% of the world's oil and has a similar share of global oil exports. [0] Those purchases are now being made in Rubels.[1] This was a direct retaliation to the USA and European sanction efforts. Before this oil was universally exchanged in USD or EUR. This has helped prop up the Rubel. 2. Russia moving back to a gold stand…
Russia's GDP is about 5% that of the US and the EU combined. It's not big enough to "destabilise" anything. Brexit (loss of an economy 4x larger than Russia's) is not having a terrible effect on the EU.
Wannabe competitors to SWIFT are even smaller in relative size, and as for India and China working together on something for a long period of time... well, I think India wants to retain access to the developed world's economy.
Sure, Russia shutting off gas supplies to the EU would be inconvenient for a while, but it would be more than inconvenient for Russia.